Support Updating apps

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Every so often my phone tells me that there are updates available for my apps.
So I go to update one of them manually, and once that's completed successfully, I can no longer access the list of updates, so I have to wait until the phone tells me again a couple of days later.
Is there any way of checking for updates manually on this phone? I have tried some of the methods shown on the forum for other phones like the Motorola Droid but the controls don't seem to match.
Any ideas, please?
(General)

My phone keeps doing "system updates"...every few minutes. I manually checked for system updates and it says I have the latest. I updated the profile and the PRL. I've restarted my phone several times...I turned OFF the automatic updates.

Since this started happening in the past couple days, my phone is SLOWER and freezes and the battery is draining FAST.